Pascal marino



PASCAL mnnmo, or Lonpon, ENGLAND.

are.

ELECTROLYTIC PROCESS FOR REMOVING OXID OR RUST.

No Drawing.

To all whom it may concern.

Be it known that I, PASCAL MAKING, a

subject of the King of Italy; and resident of 19 St. Marys Terrace,Harrow Road, London, England, h'ave'invented an Electrolytic Process forRemoving Oxid or Rust, -of-wh ich tlie following is: a specification.

This invention consists in a process whereby oxid orrust wh1 ch has beenformed onan iron or steel surface'may'be removed.- According to thisinvention the article is employed as a ,cathodeinan aqueous bath eitherof'phosphoric acid or of a phosphoric acid compound to which; phosphoricacid hasbeen added. The-electrolyte'is consti-' tuted either by asolution, of ten parts of phosphoric, acid in ninety parts of-water orby an aqueous solution. of a phosphoric acid compound to which has beenadded ten per cent. of phosphoric acid 6. g. to .a 10% Specification ofLetters Patent.

Patented Aug. 22, 1916.

Application filed April 25, 1916. Serial No. 93392.

By the use of the word iron in the claims, I do not intend to limit myinvention, but on the contrary, intend it to include steel as anequivalent thereof. Where in the .claims I speak of an aqueous bathcontaining phosphoric acid I mean a bath which that,-under the action ofthe electric curaqueous solution of sodium phosphate is added ten percent. of concentrated phosphoric acid. As is well known the conductivityof li uids increases with their temperature. onsequently in order toallow the electricv current to act more eficiently and to detach andremove the layer of. oxid or rust more rapidly the temperature of theelectrolyte should be'raised until it attains" 50 to 70 C. so that theelectro-chemical' action may take place more readily. 1 Conductiveplates of .carbonaceous material or lead are placed in the'electrolyteand serve as. anodes, the articles treated when im-- mersed in the bathserving as cathodes. The effect of the electric current is to remove thelayer of oxid from the article under treatment with the result that itssurface becomes quite clean and ready for any subsequent technical orelectrochemical operation.

rent, will cause a deposit to be formed upon the article used as acathode.

Having now particularly described and does not contain any material orcompound ascertained the nature oil my said invention which comprisesemploying such articlesas cathodes in an aqueous bath containing aphqlsphorlc acid compound and phosphoric .aci 4 3. The process ofelectrolytically removingoxid from the surface of iron articles whichcomprises employing such articles as cathodes in an aqueous bath of aphosphoric acid, compound which contains 10 per cent. of concentratedphosphoric acid.

4. The process of electrolytically remov- Ling oXid from the surface ofiron articles which comprises employing such articles as cathodes in anaqueous bath containing 10 per cent. of concentrated phosphoric acid.

- Dated this 7th day of April 1916.

PASCAL MARINO.

